Method and apparatus for reproducing three-dimensional sound field

Abstract

Provided is a method and apparatus for reproducing a three-dimensional (3D) sound field. A method of reproducing a 3D sound field may determine a control region based on a wavelength of an excitation frequency, set, based on a loudspeaker array, at least one candidate control point in the control region, and determine a non-uniform control point corresponding to a non-uniform loudspeaker.

What is claimed is: 
     
       1. A method of reproducing a three-dimensional (3D) sound field, the method comprising:
 determining a control region based on a wavelength of an excitation frequency; 
 setting, based on a loudspeaker array, at least one candidate control point in the control region; 
 determining, from the at least one candidate control point, a non-uniform control point corresponding to a non-uniform loudspeaker; and 
 determining whether to add the non-uniform control point to a control point. 
 
     
     
       2. The method of  claim 1 , wherein the determining whether to add the non-uniform control point to the control point comprises:
 determining whether to add the non-uniform control point to the control point based on an angle between a non-uniform unit vector corresponding to the non-uniform control point and a target unit vector corresponding to a target control point; and 
 adding the non-uniform control point to the control point in response to the non-uniform control point being determined to be added to the control point. 
 
     
     
       3. The method of  claim 1 , wherein the determining of the non-uniform control point comprises determining the non-uniform control point based on an inner product of a candidate unit vector corresponding to the at least one candidate control point and a target unit vector corresponding to the target control point. 
     
     
       4. The method of  claim 1 , wherein the determining of the control region comprises:
 calculating a radius based on the wavelength of the excitation frequency; and 
 determining, to be the control region, a virtual control sphere generated based on the radius. 
 
     
     
       5. The method of  claim 4 , wherein the setting of the at least one candidate control point comprises setting the at least one candidate control point at a point where a virtual line, connecting a center of the control sphere and the loudspeaker array, intersects a boundary of the control sphere. 
     
     
       6. The method of  claim 1 , further comprising:
 generating a control point matrix using the non-uniform control point; and 
 calculating a cost function based on the control point matrix, a transfer function, a pressure of a reproduced sound field, and a pressure of a target sound field. 
 
     
     
       7. The method of  claim 6 , further comprising:
 calculating a magnitude of a non-uniform unit vector corresponding to the non-uniform control point based on the transfer function, the pressure of the target sound field, and the control point matrix. 
 
     
     
       8. An apparatus for reproducing a three-dimensional (3D) sound field, the apparatus comprising:
 a control region determining unit to determine a control region based on a wavelength of an excitation frequency; 
 a setting unit to set, based on a loudspeaker array, at least one candidate control point in the control region; and 
 a control point determining unit to determine, from the at least one candidate control point, a non-uniform control point corresponding to a non-uniform loudspeaker. 
 
     
     
       9. The apparatus of  claim 8 , wherein the control point determining unit determines whether to add the non-uniform control point to the control point based on an angle between a non-uniform unit vector corresponding to the non-uniform control point and a target unit vector corresponding to a target control point. 
     
     
       10. The apparatus of  claim 8 , wherein the control point determining unit determines the non-uniform control point based on an inner product of a candidate unit vector corresponding to the at least one candidate control point and a target unit vector corresponding to the target control point. 
     
     
       11. The apparatus of  claim 8 , wherein the control region determining unit calculates a radius based on the wavelength of the excitation frequency, and determines a virtual control sphere generated based on the radius to be the control region. 
     
     
       12. The apparatus of  claim 11 , wherein the setting unit sets the at least one candidate control point at a point where a virtual line, connecting a center of the control sphere and the loudspeaker array, intersects a boundary of the control sphere. 
     
     
       13. The apparatus of  claim 8 , further comprising:
 a calculator to generate a control point matrix using the non-uniform control point, and to calculate a cost function based on the control point matrix, a transfer function, a pressure of a reproduced sound field, and a pressure of a target sound field. 
 
     
     
       14. The apparatus of  claim 13 , wherein the calculator calculates a magnitude of a non-uniform unit vector corresponding to the non-uniform control point based on the transfer function, the pressure of the target sound field, and the control point matrix.